Tapered bore hunting rifles?

[Catfish]

I guess you never do get to old to learn. I`ve been loading my own since the 60`s and playing with wildcats since the 80`s. I read alot about blastics and guns in general but never heard of the tapered bore. Guess it must not be a real hot idea since it`s been around that long and no one is playing with it now. It is an interisting consept though.